Crushing-mill.



T. J.. STURTEVANT.

GRUSHING MILL.

APPLICATION FILED JULY 19, 1911.

Patented Aug. 18, 1914,

3 SHEETS-SHEET '1.

[NVE/VTOR- Atlorne q IHL' NORRIS PETERS ca. PHOTO-.LITHQ, WASHINGTON. D. C.

T., J- STURTEVANT.

GRUSHING MILL. APBLIOATION-IILED JULY 19,1911.

w m 1 m Am M m WNW W w .W\ um N\ m vm A V n W mm THE NORRIS PETERS CO1. PHOTO-LITHQ. WASHINGTON. D- C.

T. J. STURTEVANT.

OBUSHING MILL. APPLICATION FILED JULY19,1911.

Patented Aug. 18, 1914.

3 SHEETS-SHEET 3.

INVENTOR:

- UNITED STATES PATENT OFFICE.

THOMAS JOSEPH STURTEVANT, OF WELLESLEY, MASSACHUSETTS, ASSIGNOR TO STURTEVANT MILL COMPANY, A CORPORATION OF MAINE.

ORUSHING-MILL.

Specification of Letters Patent.

Patented Aug. 18, 1914.

Application filed. July 19,1911. Serial No. 639,456.

T 0 all whom it may concern Be it known that I, THOMAS J. SrUR'rn- VANT, a citizen of the United States, residprovements in Crushing-Mills, of which the following is a speclficatlon, reference beinghad therein to the accompanying drawings.

This invention relates to that class of crushing mills, for reducing rocks, ores, etc., in which the material is crushed between the inner face of a rotating ring and the outer I face or faces of a cooperating crushing roll or rolls within said ring, and by which said ring is supported; the crushing rolls being forced elastically outward toward the inner face of said ring by springs which afford the necessary crushing pressure. ing ring is thus a freely movable ring, or a ring which is free to move radially or in a plane transverse to its axis of rotation, said ring being driven or revolved by power applied to one or more of the rolls by which it is yieldingly supported.

In the preferred construction of the in vention three spring-pressed crushing rolls will be employed, although a mill embodying the present invention might be provided with one, two, or more than three springpressed ring-supporting crushing rolls. In the preferred construction employing three crushing rolls the uppermost spring-supported roll will mostly carry the weight of the ring and will be positively driven, so as to revolve said ring; while the two lower rolls will be pushed outward by springs toward the crushing face of said ring. The crushing spring pressure of the three rolls will, with this arrangement, be substantially equalized among the several rolls, and the ring will automatically adjust itself to the forces acting upon it in the crushing operation.

The rolls and ring are inclosed in a suitable casing to which the material to be crushed is fed and from which the crushed material is discharged. In machines of this class the parts inclosed within the casing of the mill have heretofore been more or less inaccessible, the mill constructions being such that much time and labor are consumed in opening the casings of the mills for reand the ring. The crushpairs or replacements, and in closing the same. This objection is avoided in the present improved mill by providing a two-part casing one part of which is movably mounted so that by sliding or otherwise moving said part away from the other part access may be readily afforded to the chamber of the mill when necessary, as when repairs are to be made or parts are to be renewed or replaced. In a mill of this class the material to be acted on is held by centrifugal force on the inner surface of a rotating ring, the crushing rolls are forced yieldingly outward to engage with the inner surface of said ring, or against the material held thereon by centrifugal force, .and the material is reduced by being pinched between the rolls The crushing or reducing action of the rolls, co-acting with the ring, tends to displace the material held on the inner surface of the ring, causing a continuous discharge of material from the ring, such discharged material being continuously replaced by material entering from the feed spout.

In the accompanying drawings Figure 1 is a side view, partly in section, of the improved crushing mill. Fig. 2 is an end View of the same, looking from the right of Fig. 1. Fig. 3 is a side view with the movable part of the casing, and the parts movable therewith, displaced from the fixed casing and the relatively stationary parts of the mill. F 4t is a transverse section of the mill through the stand 15 Fig. 3. Fig. 5 is a detail view of one of the yielding flanged bearings.

Referring to the drawings, 12 denotes the base of the mill to which is bolted a stand 13. Slidingly supported on the base 12 is a bed 14.- to which is bolted a stand 15. The mill casing consists of fixed and movable parts 16 and 17, the fixed part 16 being bolted to or formed rigid with the stand 13, and the movable part-17 being bolted to or formed rigid with the stand 15.

In the present preferred embodiment of the invention, employing three crushing rolls 18, the stands 13 and 15 which supports the opposite ends of the shafts 22 are each provided with three yielding bearings 19, 20 and 21, for the shafts 22 to which said rolls are attached. The upper shaft 22 carrying the upper roll 18 is supported by bearings 19 within yokes 24 attached to bolts 25 encircled by springs 26 interposed between the tops of the stands 13 and and washers 27 encircling said bolts and held in place by nuts 28 threaded on said bolts. The springs 26 have a pulling action on the bearings 19. The upper shaft 22, supported in the bearings 19, is, in the present instance, the driving shaft, and is provided with a pulley 29 to which power may be applied for positively driving the upper crushing roll 18 which thus serves to rotate the crushing ring 23. The lower bearings and 21 for the-two lower crushing rolls, are pushed outward toward the inner face of the rototing crushing ring'23 by springs 30 con fined in suitable pockets in the stands 13 and 15. Each of the lower bearings 20 is provided with a forked or looped rod 31 having a head portion 32 against which a spring 30 bears, and each of the lower bearings 21 is provided with a single rod 33 extending through the forked or looped part of the rod 31 and likewise having a head or flange 32 against which a spring 30 bears; this arrangement of parts affording a compact construction and enabling the pressure of the springs 30 to be evenly applied to the yielding bearings 20 and 21.

The movable bed 14 is provided on its under side with racks 34 meshing with pinions on a cross shaft 36 which is preferably provided with squared ends to which a crank may be applied for the purpose of rotating said shaft and thereby sliding the said bed 14, carrying the stand 15 and the movable casing part 17, toward and from the stand 13- carrying the fixed casing part 16. When the casing parts are in juxtaposition, as shown in F ig. 1, and the casing is closed, said parts may be secured together by bolts 37 passing through ears 38 with which the said casing parts may be provided.

The shafts 22 are preferably provided with collars 39 which are secured thereto in any suitable manner and which serve to exclude dust from the bearings of the roll carrying shafts 22. The casing parts 16 and 17 are provided with radially disposed oval or slotted openings 40 which are closed by spring-pressed dust-plates 41 supported from the bearings 19, 20 and 21 by suitable pins 42, so that the dust-plates may follow the radial movements of the said bearings and thus keep the chamber of the mill closed at its opposite sides. The shafts 22 are provided with two collars 39 on each side of the stand 13, said collars not only serving to exclude dust from the bearings for the said shafts but also serving to prevent endwise movement thereof relative to the said stand 13. The said shafts 22 are each provided with a dust collar 39 on one side only of the stand 15, dust being excluded from the outer ends of the said shafts 22 by caps 43 attached to the outer ends of the bearings 19, 20 and 21.

The pressure of the springs 26 may be regulated by adjusting the nuts 28 on the suspending bolts 25, and the pressure of the springs 30 may be adjusted by using a greater or lesser number of washers 46 in connection with said springs, said washers being mounted adjacent to the heads 32 of the rods 31 and 33; or they may be placed beneath the plates 44 bolted to the stands 13 and 15, and which plates are to be removed when access to the springs 30 is desired.

From the foregoing it will be understood that the invention comprises a simple and compact construction of ring-roll mill in which the crushing ring is freely mounted and in which said ring is driven by one or more of the crushing rolls by which it is supported. It will be observed that in this improved construction the weight of the ring is supported by yielding or spring-acted bearings disposed about the ring, so that the spring pressure will be evenly applied to the crushing rolls. The crushing ring 23 is preferably constructed with an inner or crushing face which is concave transversely, and the crushing rolls 18 are preferably provided with transverse convex crushing faces, as shown, and as is common in the art. The bearings 19, 20 and 21are preferably provided with flanges 45 which slightly overlap.

the sides of the stands 13 and 15 and thereby prevent endwise movement of said bearings relative to said stands. It will also be apparent that the improved construction is such that access may readily be had to the parts inclosed in the casing of the mill simply by removing the bolts by which the.bed 14 is secured to the base 12 and the bolts 37 by which the two parts of the casing are secured together, and then by turning the shaft 36 the traveling bed 14 may be moved, to the position shown in Fig. 3 to carry the movable stand 15 and its connected movable casing part 17 away from the stand 13 and its connected fixed casing part 16. The openings in the dust plates 41 are such as will permit the dust excluding collars 39 to pass freely through said plates so as to remain in place with the shafts 22 when the dust plates which are supported from the traveling bed or carriage 14 are moved to the right, as shown in Fig. 3. When the parts are in the positions shown in Fig. 3 the crushing ring 23 may be mounted in place on the crushing rolls, or may be dismounted therefrom, and access generally to the parts inclosed by the casing will readily be afforded, as will be understood. The material to be crushed is fed to the crushing elements from a hopper 46 through a suitable feed spout 47.

The construction herein shown and described provides an efiicient ring-roll crushing mill which is inexpensive-to manufacture and which will be very durable in use.

Having thus described my invention I claim and desire to secure by Letters Patent:

1. In a crushing mill, the combination with one or more crushing rolls, a shaft for each of said rolls, and a crushing ring supported and driven by said roll or rolls, of a twopart casing inclosing the said crushing elements and one part of which is movably mounted relative to the other part so that the said casing may be opened when access to the chamber of the mill is desired, a traveling bed carrying the movable part of said casing, a stand on said bed supporting one end of said shaft or shafts, and a base on which said traveling bed slides and which is provided with a stand supporting the other end of said shaft or shafts.

2. A crushing mill comprising one or more yieldingly-mounted crushing rolls, a crushing ring supported by said roll or rolls. means for driving said roll or rolls and thereby rotating said ring, a two-part casing inclosing said crushing elements and comprising fixed and movable partsQa sliding bed on which one part of said casing is supported, a base on which said sliding bed is movable, and means for operating said sliding bed when said casing is to be opened or closed.

3. A ring-roll crushing mill comprising one or more yieldingly-mounted crushing rolls, a crushing ring supported by said roll or rolls, a two-part casing inclosing said crushing elements, yieldingly-mounted hearings on opposite sides of said. casing and from which said roll or rolls are supported, and a traveling bed with which one part of said casing is connected so that said casing may be opened and closed by moving said traveling bed.

4c. in a ring-roll crushing mill, the combination with a plurality of crusning rolls, all of which are yicldingly mounted, and a crushing ring supported and driven by said rolls, of a driving shaft, stands supporting said shaft, pullingsprings arranged on the outside of said stands and acting on the uppermost of said rolls, and pushing springs housed within the said stands and acting on the others of said rolls.

5. In a ring roll crushing mill, the com.- bination with a plurality of yieldinglymounted crushing rolls and a crushing ring supported and driven thereby, of bearings from which the uppermost of said rolls is supported, springs for pulling said bearings upward, bearings from which the other rolls are supported, push-rods acting on said last-named bearings and pushing springs acting on said rods.

6. In a ring roll crushing mill, the combination with a plurality of yieldinglymounted crushing rolls and a crushing ring srmported and driven thereby, of a driving shaft. stands supporting said shaft, bearings in said stands and in which bearings said shaft, carrying the uppermost of said rolls, is supported, springs for pulling said bearings upward, bearings in said stands from which the other rolls are supported, push rods acting on said last-named bear ings, pushing springs arranged in said stands and acting on said rods, a two-part casing inolosing said crushing members,and means for moving one part of said casing from and toward the other part thereof.

7. In a ring roll crushing mill, the combination with a plurality of yieldinglymounted crushing rolls and a crushing ring supported and driven thereby, of bearings from which the uppermost of said rolls is supported, springs for pulling said bearings upward, bearings from which the other rolls are supported, push rods acting on said last named bearings, pushing springs acting on said rods, a two-part casing inclosing said crushing members, means for moving one part of said casing from and toward the other part thereof, and springpressed dust-plates closing openings on opposite sides of said casing, said dust plates being movable radially of said ring, with said bearings.

A ring-roll crushing mill comprising a revolving ring and a spring-mounted crushing roll turning on a substantially stationary axis and arranged within and supporting said ring, whereby the ring is free to yield, and is cushioned on its supporting roll, a mill casing vertically divided in a plane transverse to the axis of said supporting roll, means for securing together the divided opposite parts of said casing, and means for moving one part of said casing from and toward the other part thereof.

9, In a ring-roll crushing mill, the combination with a revolving ring and a plurality of rolls within said ring and turning on substantially stationary axes, one or more of said rolls supporting the said ring, and means for yieldingly supporting said rolls, whereby the ring is cushioned thereon, a mill casing divided in a plane transverse to the axes of said ring-inclosed rolls, means for securing together the divided opposite parts of said casing, and means for removing one part of said casing from the other so as to permit said ring to be dismounted from its inclosed rolls and removed from said casing. 1

10. In it crushing mill comprising the combination with a revolving ring and a plurality of rolls encircled thereby and supporting said ring, springs arranged to resist the inward displacement of said rolls so as to cushion the latter, a casing divided into two parts in a plane transverse to the aXes of said rolls, means for securing the two parts of said casing together, and means for moving one casing part away from the other in such a manner that the said ring and the other parts within said casing will be exposed.

11. In a ring roll crushing mill, the combination with two opposite bearing stands, of a vertically divided casing between said stands and comprising two parts that may be secured together, a base part to which one bearing stand and adjacent casing part is secured, and a loose ring capable of rotating in a vertical planewithin said casing, a plurality of crushing rolls within said casin g and encircled by said ring, shafts projecting through opposite ends of said casing, and bearings for said shafts on opposite sides of said casing.

12. In a ring roll crushing mill, the combination with one or more yieldingly-mounted crushing rolls and a crushing ring supported and driven thereby, of a two-part casing inclosing said crushing members, stands on opposite sides of said casing, yielding bearings mounted in said stands, one or more shafts supported by said bearings and carrying said roll or rolls, a movable bed on which one of said stands is mounted and with which stand one part of said casing is connected, and means for moving said bed on the base of the machine. I

13. In a ring roll crushing mill, the combination with one or more yieldingly-mounted crushing rolls and a crushing ring supported and driven thereby, of a two-part casing inclosing said crushing members, stands on opposite sides of said casing, yielding bearings mounted in said stands, one or more shafts supported by said bearings and carrying said roll or rolls, springpressed and radially movable dust-plates closing openings for said shafts on opposite sides of said casing, a movable bed on which one of said stands is mounted and with which stand one part of said casing is connected, and means for moving said bed on the base of the machine.

14%. In a ring-roll crushing mill, the combination with one or more yieldingly-mounted crushing rolls and a crushing ring supported and driven thereby, of a two-part casing inclo'sing said crushing members, stands on opposite sides of said casing, yielding bearings mounted in said stands, one or more shafts supported'by said bearings and carrying said roll or rolls, a mov able bed on which one of said stands is mounted and with which stand one part of said casing is connected, said bed being provided beneath with racks, pinions meshing with said racks and a shaft mounted on the machine base and carryingv said pinion.

15. In a ring roll crushing mill, the combination with one or more yieldingly-mounb ed crushing rolls and a crushing ring supported and driven thereby, of a two-part casing inclosing said crushing members, stands on opposite sides of said casing, yielding bearings mounted in said stands, one or more shafts supported by said bearings and carrying said roll or rolls, spring pressed and radially movable dust-plates closing openings for said shafts on opposite sides of said casing, a movable bed on which one of said stands is mounted and with which stand one part of said casing is connected, said bed being provided beneath with racks, pinions meshing with said racks, and a shaft mounted on the machine base and carrying said pinion.

16. In a ring roll crushing mill, the combination with one or more yieldingly-mounted crushing rolls and a crushing ring supported thereby, of a two-part casing inclosing said crushing members, stands on oppo site sides of said casing, yielding bearings mounted in said stands, springs acting on said bearings, means for varying the tension of said springs, one or more shafts sup ported by said bearings and carrying said roll or rolls, a movable bed on which one of said stands is mounted and with which stand one part of said casing is connected, and means for moving said bed on the base of the machine.

In testimony whereof I aflix my signature, in presence of two witnesses.

THOMAS JOSEPH STURTEYANT.

Copies of this patent may be obtained for five cents each by addressing the Commissioner of Iatents.

Washington, D. 0." 

